JP7183143B2 - engine controller - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine control device for controlling a fuel injection amount of a fuel injection valve of an engine.

2. Description of the Related Art Conventionally, a vehicle is known in which an auxiliary air intake passage is provided in an intake passage of an engine to bypass a throttle valve, and the auxiliary air intake passage is provided with an auxiliary air valve (starting solenoid). In such a vehicle, the engine is warmed up by opening the auxiliary air valve to increase the amount of air supplied to the engine during fast idling of the engine.

Under such circumstances, Patent Document 1 relates to an idling speed control device for an internal combustion engine. A configuration for controlling the injection amount is disclosed. Further, Patent Literature 1 discloses a configuration for controlling the opening and closing of an auxiliary air amount control valve provided in a branch passage to control the amount of auxiliary air supplied to the engine from the branch passage through an intake pipe.

Japanese Utility Model Laid-Open No. 60-49239

By the way, according to the study of the present inventor, when controlling the opening of the auxiliary air valve, the intake air amount increases as the opening of the auxiliary air valve increases. It is desirable to set the fuel injection amount based on the intake pressure signal value.

Further, according to the study of the present inventor, the smaller the opening signal value indicating the opening of the throttle valve, the more accurately the intake pressure signal value reflects the increment of the intake air amount. is a predetermined value or more, the fuel injection amount is controlled based on the opening signal value, and when the opening signal value is less than the predetermined value, the fuel injection amount is controlled based on the intake pressure signal value is desirable.

However, according to further studies by the present inventors, in the above control, when the intake air amount increases as the opening degree of the auxiliary intake valve increases, the amount of intake air that reflects the increase in the intake air amount is increased. The range in which the fuel injection amount can be set based on the air pressure signal value is limited to the low opening signal value range.

The present invention has been made through the above studies, and is an engine control that can set the fuel injection amount in consideration of a wider range of the increase in the amount of intake air that accompanies the increase in the opening of the auxiliary intake valve. The purpose is to provide an apparatus.

In order to achieve the above objects, the present invention provides a throttle valve arranged in an intake passage of an engine, an auxiliary intake valve arranged in an auxiliary intake passage bypassing the throttle valve provided in the intake passage, and the engine and a fuel injection valve that injects fuel into a vehicle, wherein an opening signal value indicating the opening of the throttle valve, or the throttle valve of the intake passage and the auxiliary A fuel injection valve control unit that controls the fuel injection amount of the fuel injection valve and controls the opening of the auxiliary intake valve based on an intake pressure signal value indicating the intake pressure downstream of the intake passage in the intake direction. an auxiliary intake valve control unit, wherein the fuel injection valve control unit controls the fuel injection amount based on the opening signal value when the opening signal value is equal to or greater than a predetermined value, and controls the opening When the signal value is less than the predetermined value, the fuel injection amount is controlled based on the intake pressure signal value, and the predetermined value is increased as the opening of the auxiliary intake valve controlled by the auxiliary intake valve control section increases. The first aspect is to increase the size.

In addition to the first aspect of the present invention, the auxiliary intake valve control unit performs control to change the opening degree of the auxiliary intake valve between a fully closed opening degree and a fully open opening degree, In a second aspect, the injection valve control unit increases the predetermined value as the degree of opening controlled by the auxiliary intake valve control unit increases from the fully closed opening to the fully open opening of the auxiliary intake valve. .

Further, according to the present invention, in addition to the first aspect, the auxiliary intake valve control section performs control to open or close the auxiliary intake valve, and the fuel injection valve control section controls the auxiliary intake valve to open or close. A third aspect is to make the predetermined value when the auxiliary intake valve is open larger than the predetermined value when the auxiliary intake valve is closed.

Further, according to the present invention, in addition to any one of the first to third aspects, the auxiliary intake valve control section fully closes the opening of the auxiliary intake valve when the intake pressure signal value is abnormal. A fourth aspect is that the fuel injection valve control unit controls the fuel injection amount based on the opening signal value when the intake pressure signal value is abnormal.

According to the engine control device according to the first aspect of the present invention, the throttle valve arranged in the intake passage of the engine, and the auxiliary intake valve arranged in the auxiliary intake passage bypassing the throttle valve provided in the intake passage. , a fuel injection valve for injecting fuel into the engine, and a control device for an engine mounted on a vehicle, wherein the opening degree signal value indicating the opening degree of the throttle valve, or the throttle valve of the intake passage and the auxiliary intake passage A fuel injection valve control unit that controls the fuel injection amount of the fuel injection valve based on an intake pressure signal value that indicates the intake pressure downstream in the intake direction, and an auxiliary intake valve control that controls the opening of the auxiliary intake valve. The fuel injection valve control unit controls the fuel injection amount based on the opening signal value when the opening signal value is equal to or greater than a predetermined value, and controls the fuel injection amount based on the opening signal value when the opening signal value is less than the predetermined value. Since the fuel injection amount is controlled based on the intake pressure signal value, and the larger the opening of the auxiliary intake valve controlled by the auxiliary intake valve control unit, the predetermined value is increased, the opening of the auxiliary intake valve increases. It is possible to set the fuel injection amount in consideration of the increase in the intake air amount due to the increase in the intake air amount in a wider range.

Further, according to the engine control device according to the second aspect of the present invention, the auxiliary intake valve control section performs control to change the opening degree of the auxiliary intake valve between the fully closed opening degree and the fully open opening degree. , the fuel injection valve control unit increases the predetermined value as the degree of opening controlled by the auxiliary intake valve control unit increases from the fully closed opening to the fully open opening of the auxiliary intake valve. While finely controlling the opening, the fuel injection amount can be set by taking into account the increase in the amount of intake air that accompanies the increase in the opening of the auxiliary intake valve over a wider range.

Further, according to the engine control device according to the third aspect of the present invention, the auxiliary intake valve control unit performs control to open or close the auxiliary intake valve, and the fuel injection valve control unit performs control to open or close the auxiliary intake valve. increases the predetermined value when the auxiliary intake valve is open more than the predetermined value when the valve is closed, so the increase in the amount of intake air due to the increase in the opening of the inexpensive auxiliary intake valve can be considered in a wider range when setting the fuel injection amount.

Further, according to the engine control device according to the fourth aspect of the present invention, the auxiliary intake valve control section sets the opening degree of the auxiliary intake valve to the fully closed opening degree when there is an abnormality in the intake pressure signal value, If there is an abnormality in the intake pressure signal value, the fuel injection valve control unit controls the fuel injection amount based on the opening signal value. Injection of fuel can be prevented.

FIG. 1 is a schematic diagram showing the configuration of an engine control device according to a first embodiment of the present invention. FIG. 2 is a flowchart showing fuel injection amount calculation processing according to the first embodiment of the present invention. FIG. 3 is a diagram showing an example of a map used in fuel injection amount calculation processing in the first embodiment of the present invention. FIG. 4 is a flowchart showing fuel injection amount calculation processing according to the second embodiment of the present invention. FIG. 5 is a diagram showing an example of a map used in the fuel injection amount calculation process in the second embodiment of the invention.

Hereinafter, an engine control device according to an embodiment of the present invention will be described in detail with reference to the drawings as appropriate.

(First embodiment)
<Configuration of Engine Control Device>
The configuration of the engine control device according to the present embodiment will be described in detail with reference to FIG.

FIG. 1 is a schematic diagram showing the configuration of an engine control device according to a first embodiment of the present invention.

As shown in FIG. 1, the engine control device 21 in the present embodiment is an electronic control device such as an ECU (Electronic Control Unit), and is a saddle type engine that transmits the driving force of the engine 1, which is an internal combustion engine, to the drive wheels. It is installed in a vehicle such as a vehicle.

The engine 1 is connected to an intake valve 14 provided at a connecting portion between a combustion chamber 18 and an intake passage 19, an exhaust valve 15 provided at a connecting portion between the combustion chamber 18 and an exhaust passage 20, and a piston 17. a piston 17; a combustion chamber 18; an intake passage 19 communicating with the combustion chamber 18; and an exhaust passage 20 communicating with the combustion chamber 18. ing.

The intake system of the engine 1 includes a starting solenoid 7, a throttle valve 10, a fully closed stopper 11, an idle adjustment screw 12, an auxiliary passage 13 bypassing the throttle valve 10, and a throttle valve 10 provided in an intake passage 19. and an auxiliary intake passage 24 that bypasses.

The starting solenoid 7 is an auxiliary air valve provided in the auxiliary intake passage 24, and is controlled by the auxiliary intake valve control section 23 to open and close the auxiliary intake passage 24 during fast idling, which is idling when the engine 1 is started. Adjust the inspiratory volume. The starting solenoid 7 is an inexpensive ON/OFF type open/close valve for fast idling that can be controlled only to a fully closed opening or a fully open opening. The starting solenoid 7 is opened during fast idling of the engine 1 to warm up the engine 1 by increasing the amount of air supplied to the engine 1 from the outside. The valve is closed when the fast idle is finished.

The throttle valve 10 is provided upstream of the fuel injection valve 8 in the intake direction of the intake passage 19 (rightward in FIG. 1), and is a mechanical or electronic open/close valve. The throttle valve 10 is opened and closed between a fully open position, which is a fully open position, and a fully closed position, which is a fully closed position. to adjust.

The fully closed stopper 11 regulates the fully closed position of the throttle valve 10 and adjusts the amount of intake air in the intake passage 19 at the fully closed position of the throttle valve 10 .

The idle adjust screw 12 is provided in the auxiliary passage 13 and adjusts the idle speed by adjusting the amount of intake air in the auxiliary passage 13 . The idle adjust screw 12 can increase the idle speed as the amount of intake air in the auxiliary passage 13 increases.

The engine control device 21 includes a memory (not shown) and the like, and the memory stores control programs, control data, maps, and the like necessary for the engine control device 21 . The engine control device 21 executes a control program stored in a memory to detect signals input from the intake air temperature sensor 2, the throttle position sensor 3, the intake pressure sensor 4, the crank angle sensor 5 and the cooling water temperature sensor 6. , the operations of the starting solenoid 7, the fuel injection valve 8, the spark plug 9 and the throttle valve 10 are controlled.

Here, the intake air temperature sensor 2 detects the temperature of the air flowing into the intake passage 19 and inputs an intake air temperature signal indicating the detected temperature of the air to the control device 21 of the engine. The throttle position sensor 3 detects the throttle opening of the throttle valve 10 and inputs an opening signal corresponding to the detected throttle opening to the engine control device 21 . The intake pressure sensor 4 is provided in the intake passage 19 downstream of the throttle valve 10 and the auxiliary air passage 24 in the intake direction, and measures the pressure of the air flowing into the intake passage 19 including the inflow from the auxiliary air passage 24. is detected as the intake pressure, and an intake pressure signal indicating the detected intake pressure is inputted to the control device 21 of the engine.

The crank angle sensor 5 inputs crank pulses corresponding to teeth formed on the outer peripheral surface of the reluctor 16 that rotates with the rotation of the crankshaft (not shown) to the control device 21 of the engine. The cooling water temperature sensor 6 detects the temperature of cooling water flowing through a cooling water passage (not shown) of the engine 1 and inputs a cooling water temperature signal indicating the detected temperature of the cooling water to the control device 21 of the engine. The fuel injection valve 8 is provided in the intake passage 19 , and the valve opening time is controlled by the fuel injection valve control section 22 to inject an appropriate amount of fuel and supply it to the engine 1 . The spark plug 9 ignites the mixture of fuel and air in the combustion chamber 18 at timing controlled by the engine controller 21 .

Further, the engine control device 21 detects the crank angle of the engine 1 based on the crank pulse input from the crank angle sensor 5 and calculates the number of revolutions of the engine. When the throttle valve 10 is an electronic open/close valve, the engine control device 21 uses signals input from the throttle position sensor 3 and the crank angle sensor 5 to drive a drive motor (not shown) to open the throttle valve. 10 throttle opening is controlled. When the throttle valve 10 is a mechanical opening/closing valve connected to an operation member operated by the driver of the vehicle, the engine control device 21 adjusts the ignition timing of the spark plug 9 so that the engine 1 is idling. Feedback control is performed so that the rotation speed approaches the idle target rotation speed.

Further, the engine control device 21 includes a fuel injection valve control section 22 and an auxiliary intake valve control section 23 . Specifically, the fuel injection valve control unit 22 executes a fuel injection amount calculation process, which will be described later, so that the opening signal value of the opening signal input from the throttle position sensor 3 or The fuel injection amount of the fuel injection valve 8 is calculated based on the intake pressure signal value of the received intake pressure signal. The fuel injection valve control unit 22 controls the fuel injection valve 8 so as to inject the calculated fuel injection amount of fuel. The auxiliary intake valve control unit 23 is based on the cooling water temperature obtained from the cooling water temperature signal input from the cooling water temperature sensor 6 and the throttle opening obtained from the opening signal input from the throttle position sensor 3. , controls the opening and closing of the starting solenoid 7 .

The engine control device 21 configured as described above executes the following fuel injection amount calculation processing, thereby taking into account the increase in the intake air amount due to the increase in the opening of the starting solenoid 7 in a wider range. to set the fuel injection amount. The fuel injection amount calculation process will be described in detail below with reference to FIGS. 2 and 3 as well.

<Fuel injection amount calculation processing>
FIG. 2 is a flowchart showing fuel injection amount calculation processing according to the first embodiment of the present invention. FIG. 3 is a diagram showing an example of a map used in fuel injection amount calculation processing in the first embodiment of the present invention.

The fuel injection amount calculation process shown in FIG. 2 starts when the ignition switch (not shown) of the vehicle is turned on and the engine control device 21 is activated, and the fuel injection amount calculation process proceeds to step S1. The fuel injection amount calculation process shown in FIG. 2 is repeatedly executed at each predetermined control cycle such as each predetermined crank angle while the vehicle is started and the control device 21 for the engine is started.

In the processing of step S1, the fuel injection valve control section 22 determines whether or not the intake pressure signal input from the intake pressure sensor 4 is abnormal. As a result of the determination, if the intake pressure signal is abnormal, the fuel injection valve control section 22 advances the fuel injection amount calculation process to the process of step S2. For example, the fuel injection valve control unit 22 determines that the intake pressure signal is abnormal when the intake pressure signal value does not change from a specific value and stays at a specific value due to disconnection, short circuit, or the like. On the other hand, when the intake pressure signal is normal, the fuel injection valve control section 22 advances the fuel injection amount calculation process to the process of step S4.

In the processing of step S2, the auxiliary intake valve control section 23 maintains the opening degree of the starting solenoid 7 at the fully closed opening degree. As a result, the process of step S2 is completed, and the fuel injection amount calculation process proceeds to the process of step S3.

In the process of step S3, the fuel injection valve control unit 22 determines the engine speed based on the crank angle signal input from the crank angle sensor 5 regardless of the magnitude of the opening signal value indicating the opening of the throttle valve 10. The engine speed, throttle opening, and fuel injection amount stored in a memory (not shown) are calculated based on the engine speed and the throttle opening obtained based on the opening signal input from the throttle position sensor 3. The associated map is retrieved to obtain the fuel injection amount associated with the obtained engine speed and throttle opening. As a result, the process of step S3 is completed, and the fuel injection amount calculation process ends.

In the process of step S<b>4 , the auxiliary intake valve control section 23 permits opening/closing control of the starting solenoid 7 . Along with this, the auxiliary intake valve control unit 23 controls the cooling water temperature obtained from the cooling water temperature signal input from the cooling water temperature sensor 6 and the throttle opening indicated by the opening signal value input from the throttle position sensor 3. , and the opening/closing control of the starting solenoid 7 is performed. Thereby, the process of step S4 is completed, and the fuel injection amount calculation process proceeds to the process of step S5.

In the process of step S5, the fuel injection valve control section 22 determines whether or not the starting solenoid 7 is fully closed. As a result of the determination, when the starting solenoid 7 is fully closed, the fuel injection valve control section 22 advances the fuel injection amount calculation process to the process of step S6. On the other hand, when the starting solenoid 7 is fully opened, the fuel injection valve control section 22 advances the fuel injection amount calculation process to the process of step S7.

In the process of step S6, the fuel injection valve control unit 22 sets a predetermined value, which is a threshold to be compared with the opening degree signal value indicating the throttle opening degree, as shown in the map shown in FIG. memorize to As a result, the process of step S6 is completed, and the fuel injection amount calculation process proceeds to the process of step S8.

In the process of step S7, the fuel injection valve control unit 22 sets a predetermined value, which is a threshold to be compared with the opening degree signal value indicating the throttle opening degree, in the process of step S6, as shown in the map shown in FIG. A value higher than the predetermined value to be set is set and stored in the memory. Thus, the fuel injection valve control unit 22 increases the predetermined value as the opening degree of the starting solenoid 7 increases. Therefore, the predetermined value shown in FIG. 3(b) is set to a value larger (higher) than the predetermined value shown in FIG. 3(a), and the predetermined value shown in FIG. set to a value less than (lower) than As a result, the process of step S7 is completed, and the fuel injection amount calculation process proceeds to the process of step S8.

In the maps shown in FIGS. 3(a) and 3(b), the region where the throttle opening is less than a predetermined value is the PM map region where the fuel injection amount is determined based on the engine speed and the intake pressure. The area above the value is the TH map area in which the fuel injection amount is determined based on the engine speed and the throttle opening. Note that the map used in the process of step S3 is entirely a TH map area without setting a predetermined value.

The reason why the PM map area and the TH map area are divided in this way is that in the area where the throttle opening is small, the amount of change in the intake pressure relative to the amount of change in the throttle opening is large, while in the area where the throttle opening is large, the throttle opening is large. This is because the amount of change in intake pressure relative to the amount of change in throttle opening is small, so it is preferable to reflect the amount of change in intake pressure in the fuel injection amount in a region where the throttle opening is small.

The reason why the predetermined value when the opening of the start solenoid 7 is fully open is set higher than the predetermined value when the opening of the start solenoid 7 is fully closed is that the opening of the start solenoid 7 is This is because there is a demand to detect the amount of increase in the amount of intake air caused by the fully opened opening based on the intake pressure and to reflect the detected amount of increase in the amount of intake air in the fuel injection amount. If a low predetermined value is set at this time, it is only possible to reflect the increase in the intake air amount in the fuel injection amount in a narrow PM map region. On the other hand, when the opening of the starting solenoid 7 is fully open, by setting a high predetermined value, it is possible to reflect the increase in the intake air amount in the fuel injection amount in a wider PM map region. can. The predetermined value when the opening of the starting solenoid 7 is fully closed is preferably set to an opening that is slightly larger than the throttle opening corresponding to idling.

In the process of step S8, the fuel injection valve control unit 22 determines that the throttle opening indicating the opening signal value input from the throttle position sensor 3 is the predetermined value shown in FIG. 3A set in step S6 or step S7. It is determined whether or not the value is equal to or greater than the predetermined value set in FIG. 3(b). As a result of the determination, if the opening degree signal value is equal to or greater than the predetermined value, the fuel injection valve control unit 22 determines that it is in the TH map region, and advances the fuel injection amount calculation process to step S9. On the other hand, when the opening degree signal value is less than the predetermined value, the fuel injection valve control unit 22 determines that it is in the PM map area, and advances the fuel injection amount calculation process to the process of step S10.

In the process of step S9, the fuel injection valve control unit 22 determines the engine speed based on the crank angle signal input from the crank angle sensor 5 and the throttle opening signal value input from the throttle position sensor 3. Based on the degree of opening, a map that associates the engine speed, the throttle opening, and the fuel injection amount stored in the memory is searched, and the obtained engine speed and throttle opening are associated with each other. Find the fuel injection amount As a result, the process of step S9 is completed, and the fuel injection amount calculation process ends.

In the process of step S10, the fuel injection valve control unit 22 determines the engine speed based on the crank angle signal input from the crank angle sensor 5 and the intake pressure signal value input from the intake pressure sensor 4. Based on the atmospheric pressure, a map that associates the engine speed, the intake pressure, and the fuel injection amount stored in the memory is searched, and the fuel injection associated with the determined engine speed and intake pressure. ask for quantity. As a result, the process of step S9 is completed, and the fuel injection amount calculation process ends.

In the control device for the engine according to the above-described embodiment, the fuel injection amount is controlled based on the opening signal value when the opening signal value is equal to or greater than the predetermined value, and the intake pressure is controlled when the opening signal value is less than the predetermined value. The fuel injection amount is controlled based on the signal value, and the predetermined value is increased as the opening of the starting solenoid 7 controlled by the auxiliary intake valve control unit 23 increases. It is possible to set the fuel injection amount by taking into consideration the accompanying increase in intake air amount in a wider range.

Further, in the engine control device according to the present embodiment, the auxiliary intake valve control unit 23 performs control to open or close the starting solenoid 7, and the fuel injection valve control unit 22 performs control when the starting solenoid 7 is closed. Since the predetermined value when the starting solenoid 7 is open is made larger than the predetermined value when the valve is open, the increase in the amount of intake air accompanying the increase in the opening of the inexpensive starting solenoid 7 can be controlled in a wider range. The fuel injection amount can be set in consideration of this.

In addition, in the engine control device according to the present embodiment, the auxiliary intake valve control unit 23 sets the opening degree of the starting solenoid 7 to the fully closed opening degree when there is an abnormality in the intake pressure signal value, and the fuel injection valve control unit 22 is to control the fuel injection amount based on the opening signal value if there is an abnormality in the intake pressure signal value. can be prevented.

(Second embodiment)
The configuration of the engine control device according to the second embodiment of the present invention is such that, in place of the starting solenoid 7, which is an ON/OFF type opening/closing valve in FIG. is the same as that of FIG. 1 except that is replaced with an adjustable idle speed control valve (hereinafter referred to as "ISC valve"), so the description thereof will be omitted.

The ISC valve in this embodiment is an auxiliary air valve provided in the auxiliary intake passage 24, and is controlled by the auxiliary intake valve control section 23 to change the opening degree between a fully open opening degree and a fully closed opening degree. The intake air amount can be adjusted, and the idling speed of the engine 1 can be adjusted.

<Fuel injection amount calculation processing>
The fuel injection amount calculation process according to the second embodiment of the present invention will be described in detail with reference to FIGS. 4 and 5. FIG.

FIG. 4 is a flowchart showing fuel injection amount calculation processing according to the second embodiment of the present invention. FIG. 5 is a diagram showing an example of a map used in the fuel injection amount calculation process in the second embodiment of the invention.

In addition, in FIG. 4, the same step numbers are attached to the portions that are the same as those in FIG. 2, and the description thereof will be omitted.

In the processing of step S1, the fuel injection valve control section 22 determines whether or not the intake pressure signal input from the intake pressure sensor 4 is abnormal. As a result of the determination, if the intake pressure signal is abnormal, the fuel injection valve control section 22 advances the fuel injection amount calculation process to the process of step S21. On the other hand, when the intake pressure signal is normal, the fuel injection valve control unit 22 advances the fuel injection amount calculation process to the process of step S22.

In the process of step S21, the auxiliary intake valve control section 23 maintains the opening of the ISC valve at the fully closed opening. Thereby, the process of step S21 is completed, and the fuel injection amount calculation process proceeds to the process of step S3.

In the processing of step S22, the auxiliary intake valve control section 23 permits the opening/closing control of the ISC valve. As a result, the auxiliary intake valve control unit 23 determines the temperature of the cooling water obtained from the cooling water temperature signal input from the cooling water temperature sensor 6 and the engine speed obtained based on the crank angle signal input from the crank angle sensor 5. , and the opening/closing control of the ISC valve is performed, the process of step S22 is completed, and the fuel injection amount calculation process proceeds to the process of step S23.

In the process of step S23, the fuel injection valve control section 22 reads the opening of the ISC valve. Thereby, the process of step S23 is completed, and the fuel injection amount calculation process proceeds to the process of step S24.

In the processing of step S24, the fuel injection valve control unit 22 sets a predetermined value, which is a threshold to be compared with the opening degree signal value indicating the throttle opening degree, according to the opening degree of the ISC valve. Specifically, the fuel injection valve control unit 22 searches the map shown in FIG. 5 and sets a predetermined value according to the ISC valve opening. In the map shown in FIG. 5, the predetermined value increases as the degree of opening of the ISC valve increases. Thereby, the process of step S24 is completed, and the fuel injection amount calculation process proceeds to the process of step S8.

As shown in FIG. 5, the map for obtaining the predetermined value includes a straight line L1 along which the relationship between the opening degree of the ISC valve and the predetermined value changes linearly, an upwardly convex curve L2, or a downwardly convex curve L2. A curve L3 is set. The straight line L1, the curved line L2, and the curved line L3 have a relationship in which the predetermined value increases as the degree of opening of the ISC valve increases. The map for obtaining the predetermined value is not limited to the case where the straight line L1, the curved line L2, and the curved line L3 are set. Any straight line or curve having a relationship that the greater the opening of the ISC valve, the greater the predetermined value. can be set.

In the control device for the engine according to the above-described embodiment, the fuel injection amount is controlled based on the opening signal value when the opening signal value is equal to or greater than the predetermined value, and the intake pressure is controlled when the opening signal value is less than the predetermined value. The fuel injection amount is controlled based on the signal value, and the predetermined value is increased as the opening of the ISC valve controlled by the auxiliary intake valve control unit 23 increases. It is possible to set the fuel injection amount by considering the increase in amount in a wider range.

Further, in the engine control device of the present embodiment, the auxiliary intake valve control unit 23 performs control to change the opening degree of the ISC valve between the fully closed opening degree and the fully open opening degree, and the fuel injection valve control unit 22 is to increase the predetermined value as the degree of opening controlled by the auxiliary intake valve control unit 23 increases from the degree of fully closed to the fully open degree of the ISC valve. , the fuel injection amount can be set in consideration of the increase in the intake air amount due to the increase in the opening of the ISC valve.

Further, in the engine control device of the present embodiment, the auxiliary intake valve control unit 23 sets the opening degree of the ISC valve to the fully closed opening degree when there is an abnormality in the intake pressure signal value, and the fuel injection valve control unit 22 If there is an abnormality in the intake pressure signal value, the fuel injection amount is controlled based on the opening signal value. can be prevented.

The present invention is not limited to the above-described embodiments in terms of the types, shapes, arrangements, numbers, etc. of the members, and the gist of the invention is not deviated from, such as by appropriately replacing the constituent elements with those having equivalent effects. Of course, it can be appropriately changed within the range.

Specifically, in the first and second embodiments, the auxiliary passage 13 is provided with the idle adjustment screw 12, but the auxiliary passage 13 and the idle adjustment screw 12 may be omitted.

Further, in the first embodiment and the second embodiment, the predetermined value is set to a constant value, but the predetermined value is not limited to this, and may be changed according to the engine speed.

Further, in the first embodiment and the second embodiment, in the processes of steps S3, S9, and S10 of the fuel injection amount calculation process, the fuel injection amount is obtained by searching the map, but the present invention is not limited to this. Instead, the fuel injection amount may be calculated by using a predetermined arithmetic expression.

As described above, the present invention provides an engine control system that can set the fuel injection amount in consideration of the increase in the amount of intake air that accompanies the increase in the opening of the auxiliary intake valve in a wider range. It is expected that it can be widely applied to control systems for engines of vehicles and the like due to its universal character.

DESCRIPTION OF SYMBOLS 1... Engine 2... Intake air temperature sensor 3... Throttle position sensor 4... Intake pressure sensor 5... Crank angle sensor 6... Cooling water temperature sensor 7... Starting solenoid 8... Fuel injection valve 9... Spark plug 10... Throttle valve 11... Fully closed stopper DESCRIPTION OF SYMBOLS 12... Idle adjust screw 13... Auxiliary passage 14... Intake valve 15... Exhaust valve 16... Reluctor 17... Piston 18... Combustion chamber 19... Intake passage 20... Exhaust passage 21... Engine control device 22... Fuel injection valve control part 23... Auxiliary intake valve control unit 24 Auxiliary intake passage

Claims (4)

a throttle valve arranged in an intake passage of an engine; an auxiliary intake valve arranged in an auxiliary intake passage that bypasses the throttle valve provided in the intake passage; and a fuel injection valve that injects fuel into the engine. A control device for an engine mounted on a vehicle,
Based on an opening degree signal value indicating the opening degree of the throttle valve, or an intake pressure signal value indicating the intake pressure downstream in the intake direction from the throttle valve and the auxiliary intake passage in the intake passage, the fuel injection valve and an auxiliary intake valve control unit that controls the opening of the auxiliary intake valve,
The fuel injection valve control unit
When the opening signal value is equal to or greater than a predetermined value, the fuel injection amount is controlled based on the opening signal value, and when the opening signal value is less than the predetermined value, the intake pressure signal value is used to control the fuel injection amount. controlling the fuel injection amount, and increasing the predetermined value as the degree of opening of the auxiliary intake valve controlled by the auxiliary intake valve control unit increases;
An engine control device characterized by: The auxiliary intake valve control section
performing control to open or close the auxiliary intake valve;
The fuel injection valve control unit
making the predetermined value when the auxiliary intake valve is open larger than the predetermined value when the auxiliary intake valve is closed;
2. The engine control device according to claim 1, wherein: The auxiliary intake valve control section
performing control to change the opening degree of the auxiliary intake valve between a fully closed opening degree and a fully open opening degree;
The fuel injection valve control unit
The predetermined value is increased as the degree of opening controlled by the auxiliary intake valve control unit increases from the fully closed opening to the fully open opening of the auxiliary intake valve.
2. The engine control device according to claim 1, wherein: The auxiliary intake valve control section
If there is an abnormality in the intake pressure signal value, the degree of opening of the auxiliary intake valve is set to the degree of fully closed;
The fuel injection valve control unit
controlling the fuel injection amount based on the opening degree signal value when the intake pressure signal value is abnormal;
The engine control device according to any one of claims 1 to 3, characterized in that:

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