JP2017145741A - Automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To finish an abnormality diagnosis of either of an in-cylinder injection mode and a port injection mode more earlier.SOLUTION: When a port injection counter Cpfi is not smaller than an in-cylinder injection counter Cdi when a temperature Tw of the cooling water of an engine reaches a threshold Twref or higher (S110 S170), a port injection mode is held, and after performing an abnormality diagnosis, an in-cylinder injection mode is held, and the abnormality diagnosis is performed (S180 to S250). On the other hand, when the in-cylinder injection counter Cdi is larger than the port injection counter Cpfi when the temperature Tw of the cooling water of the engine reaches the threshold Twref or higher (S110, S170), the in-cylinder injection mode is held, and after performing the abnormality diagnosis, the port injection mode is held, and the abnormality diagnosis is formed (S260 to S330).SELECTED DRAWING: Figure 2

Description

  The present invention relates to an automobile, and more particularly to an automobile provided with an engine having an in-cylinder injection valve and a port injection valve.

  Conventionally, as this type of automobile, in an automobile equipped with an engine having an in-cylinder injector and a port injector, in the in-cylinder injection mode in which fuel is injected only from the in-cylinder injector, When the DI counter to be counted up exceeds the first predetermined value, it is determined that the in-cylinder injector is normal, and in the port injection mode in which fuel is injected only from the port injector, the count is continued according to the continuation. There has been proposed one that determines that the port injection injector is normal when the PFI counter to be increased reaches a second predetermined value or more (for example, see Patent Document 1). In this automobile, through such processing, it is individually determined that the in-cylinder injector is normal and the port injector is normal.

JP 2013-113127 A

  In such an automobile, if neither the abnormality diagnosis in the in-cylinder injection mode nor the abnormality diagnosis in the port injection mode is completed, the fuel consumption, emission, and drivability may be deteriorated. For this reason, it is required to complete one of the abnormality diagnosis in the in-cylinder injection mode and the abnormality diagnosis in the port injection mode earlier.

  The main object of the automobile of the present invention is to complete the abnormality diagnosis of one of the in-cylinder injection mode and the port injection mode earlier.

  The automobile of the present invention has taken the following means in order to achieve the main object described above.

The automobile of the present invention
An engine having an in-cylinder injection valve that injects fuel into the cylinder and a port injection valve that injects fuel into the intake port;
An in-cylinder injection mode in which an in-cylinder injection ratio that is a ratio of a fuel injection amount from the in-cylinder injection valve to a total fuel injection amount from the in-cylinder injection valve and the port injection valve is a first predetermined ratio or more; A port injection mode in which the in-cylinder injection ratio is less than or equal to a second predetermined ratio that is smaller than the first predetermined ratio, and the in-cylinder injection ratio is less than the first predetermined ratio and greater than the second predetermined ratio. Control means for switching the common injection mode to control the engine;
A car equipped with
Count-up means for counting up the first counter when in the port injection mode and counting up the second counter when in the in-cylinder injection mode;
When the cooling water temperature of the engine is lower than a predetermined water temperature, an abnormality diagnosis in the port injection mode is performed when the port injection mode is entered according to the operating state of the engine, and the engine is operated according to the operating state of the engine. When the in-cylinder injection mode is entered, an abnormality diagnosis is performed in the in-cylinder injection mode,
If the first counter is larger than the second counter when the cooling water temperature is equal to or higher than the predetermined water temperature, the control means is made to hold the port injection mode and execute an abnormality diagnosis in the port injection mode. Is completed when the first counter reaches a first predetermined value or more, and thereafter, the control means is made to hold the in-cylinder injection mode to perform an abnormality diagnosis in the in-cylinder injection mode. 2 when the counter reaches the second predetermined value or more,
When the second counter is larger than the first counter when the cooling water temperature is equal to or higher than the predetermined water temperature, the control unit is made to maintain the in-cylinder injection mode and perform abnormality diagnosis in the in-cylinder injection mode. And is completed when the second counter reaches the second predetermined value or more, and thereafter, the control means is made to hold the port injection mode to execute abnormality diagnosis in the port injection mode. An abnormality diagnosis means that is completed when a first counter reaches the first predetermined value or more;
It is a summary to provide.

  In the vehicle of the present invention, when the engine coolant temperature is lower than the predetermined water temperature, the abnormality diagnosis in the port injection mode is performed when the port injection mode is entered (accordingly) according to the operating state of the engine. The counter is counted up, and when the in-cylinder injection mode is entered (accordingly) according to the operating state of the engine, an abnormality diagnosis in the in-cylinder injection mode is performed and the second counter is counted up. If the first counter is greater than the second counter when the engine coolant temperature is equal to or higher than the predetermined water temperature, the port injection mode is maintained, abnormality diagnosis is performed in the port injection mode, and the first counter is When the first counter reaches the first predetermined value or more, the abnormality diagnosis in the port injection mode is completed, and then the in-cylinder injection mode is maintained to perform the abnormality diagnosis in the in-cylinder injection mode. At the same time, the second counter is counted up, and the abnormality diagnosis in the in-cylinder injection mode is completed when the second counter reaches a second predetermined value or more. On the other hand, if the second counter is larger than the first counter when the engine coolant temperature is equal to or higher than the predetermined water temperature, the in-cylinder injection mode is maintained to perform abnormality diagnosis in the in-cylinder injection mode. 2 counter is counted up, and when the second counter reaches the second predetermined value or more, the abnormality diagnosis in the in-cylinder injection mode is completed, and then the port injection mode is maintained and the abnormality in the port injection mode is completed. The diagnosis is executed and the first counter is counted up, and the abnormality diagnosis in the port injection mode is completed when the first counter reaches a first predetermined value or more. From these, abnormality diagnosis of one of the port injection mode and the in-cylinder injection mode (the one of the first counter and the second counter that has a larger value when the engine coolant temperature becomes equal to or higher than a predetermined water temperature) is further performed. It can be completed early.

  Here, in the “in-cylinder injection mode”, the in-cylinder injection ratio may be 100%. In the “port injection mode”, the in-cylinder injection ratio is set to 30%, 25%, 20%, etc. when the engine is loaded, and the in-cylinder injection ratio is set to 0 when the engine is operated without load. % May be used. When the engine is loaded, the in-cylinder injection ratio is not set to 0%. If the in-cylinder injection ratio is set to 0% (no fuel is injected from the in-cylinder injection valve), the in-cylinder temperature becomes relatively high. This is because sometimes the in-cylinder injection valve may be damaged, or deposits may accumulate on the in-cylinder injection valve. The reason why the in-cylinder injection ratio is set to 0% when the engine is operated without load is that the possibility that the in-cylinder temperature is relatively high is low and the above-described disadvantage is low.

  The “engine operating state” may be engine speed and volumetric efficiency.

  If the first counter and the second counter are the same when the cooling water temperature of the engine is equal to or higher than the predetermined water temperature, the abnormality diagnosis in the port injection mode and the abnormality diagnosis in the in-cylinder injection mode are executed in this order. Alternatively, the abnormality diagnosis in the in-cylinder injection mode and the abnormality diagnosis in the port injection mode may be executed in this order.

It is a block diagram which shows the outline of a structure of the motor vehicle 10 as one Example of this invention. It is a flowchart which shows an example of the abnormality diagnosis routine performed by the electronic control unit 70 of an Example.

  Next, the form for implementing this invention is demonstrated using an Example.

  FIG. 1 is a configuration diagram showing an outline of the configuration of an automobile 10 as an embodiment of the present invention. As shown in the figure, the automobile 10 according to the embodiment includes an engine 12 and an electronic control unit 70 that controls the operation of the engine 12. The vehicle 10 is configured as a vehicle that travels using only the power from the engine 12, a hybrid vehicle that travels using the power from the engine 12 and a motor (not shown), and the like.

  The engine 12 has a plurality of cylinders (for example, 4 cylinders, 6 cylinders, 8 cylinders, etc.), and uses a fuel such as gasoline or light oil to output power through four strokes of intake, compression, expansion, and exhaust. It is configured. The engine 12 includes an in-cylinder injection valve 25 that injects fuel into the cylinder, and a port injection valve 26 that injects fuel into the intake port, and any of the in-cylinder injection mode, the port injection mode, and the common injection mode. Driving is possible. The in-cylinder injection mode is a mode in which the in-cylinder injection ratio, which is the ratio of the fuel injection amount from the in-cylinder injection valve 25 to the total fuel injection amount from the in-cylinder injection valve 25 and the port injection valve 26, is greater than or equal to the first predetermined ratio. The port injection mode is a mode in which the in-cylinder injection ratio is less than or equal to a second predetermined ratio that is smaller than the first predetermined ratio, and the common injection mode is a mode in which the in-cylinder injection ratio is smaller than the first predetermined ratio and 2 This mode is set to be larger than a predetermined ratio. In the embodiment, in the in-cylinder injection mode, the in-cylinder injection ratio is set to 100%, and in the port injection mode, the in-cylinder injection ratio is set to 30%, 25%, 20%, etc. When the engine 12 is operated with no load, the in-cylinder injection ratio is set to 0%. The reason why the in-cylinder injection ratio is not 0% when the engine 12 is loaded is that the in-cylinder temperature is relatively high when the in-cylinder injection ratio is 0% (no fuel is injected from the in-cylinder injection valve 25). This is because the in-cylinder injection valve 25 may be damaged or deposits may accumulate on the in-cylinder injection valve 25. The reason why the in-cylinder injection ratio is set to 0% when the engine 12 is operated without load is that the possibility that the in-cylinder temperature becomes relatively high is low and the above-described disadvantage is low.

  In the in-cylinder injection mode, the air purified by the air cleaner 22 is sucked into the combustion chamber 29 via the throttle valve 24 and the intake valve 28, and fuel is injected from the in-cylinder injection valve 25 during the intake stroke or during the compression stroke. The reciprocating motion of the piston 32, which is explosively burned by the electric spark from the spark plug 30 and is pushed down by the energy, is converted into the rotational motion of the crankshaft 16.

  In the port injection mode and the common injection mode, the air cleaned by the air cleaner 22 is sucked through the throttle valve 24 and fuel is injected from the port injection valve 26 to mix the air and the fuel. Of the piston 32 which is sucked into the combustion chamber 29 through 28, injects fuel from the in-cylinder injection valve 25 during the intake stroke or in the compression stroke, explodes and burns by an electric spark by the spark plug 30, and is pushed down by the energy. The reciprocating motion is converted into the rotational motion of the crankshaft 16.

  Exhaust gas discharged from the combustion chamber 29 via the exhaust valve 31 has a purification catalyst (three-way catalyst) that purifies harmful components such as carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (NOx). It is discharged to the outside air through the purification device 34.

  Although not shown, the electronic control unit 70 is configured as a microprocessor centered on a CPU, and includes a ROM for storing a processing program, a RAM for temporarily storing data, and an input / output port in addition to the CPU.

Signals from various sensors necessary for controlling the operation of the engine 12 are input to the electronic control unit 70 via an input port. Examples of signals input to the electronic control unit 70 include the following.
Crank angle θcr from the crank position sensor 40 that detects the rotational position of the crankshaft 16
-Cooling water temperature Tw from the water temperature sensor 42 which detects the temperature of the cooling water of the engine 12
Cam angles θci and θco from a cam position sensor 44 that detects the rotational position of the intake camshaft that opens and closes the intake valve 28 and the rotational position of the exhaust camshaft that opens and closes the exhaust valve 31
A throttle opening TH from a throttle valve position sensor 46 that detects the position of the throttle valve 24 provided in the intake pipe
Intake air amount Qa from the air flow meter 48 attached to the intake pipe
Intake air temperature Ta from the temperature sensor 49 attached to the intake pipe
Air-fuel ratio AF from the air-fuel ratio sensor 35a attached to the exhaust pipe
An oxygen signal O2 from an oxygen sensor 35b attached to the exhaust pipe

Various control signals for controlling the operation of the engine 12 are output from the electronic control unit 70 via the output port. Examples of signals output from the electronic control unit 70 include the following.
A drive control signal to the throttle motor 36 that adjusts the position of the throttle valve 24 A drive control signal to the in-cylinder injection valve 25 A drive control signal to the port injection valve 26 An ignition coil 38 integrated with the igniter Drive control signal

  The electronic control unit 70 calculates the rotational speed of the crankshaft 16, that is, the rotational speed Ne of the engine 12, based on the crank angle θcr from the crank position sensor 40. Further, the electronic control unit 70 is actually sucked in one cycle with respect to the volumetric efficiency (the stroke volume per one cycle of the engine 12) based on the intake air amount Qa from the air flow meter 48 and the rotational speed Ne of the engine 12. Air volume ratio) KL is calculated.

  In the automobile 10 of the embodiment configured as described above, the electronic control unit 70 controls the intake air amount control, the fuel injection control of the engine 12 so that the engine 12 is operated with the target rotational speed Ne * and the target torque Te *. Ignition control is performed. Since the intake air amount control and ignition control do not form the core of the present invention, a detailed description thereof will be omitted. Regarding the fuel injection control, first, the execution injection mode is set from the in-cylinder injection mode, the port injection mode, and the common injection mode based on the rotational speed Ne of the engine 12 and the volumetric efficiency KL. Subsequently, based on the intake air amount Qa and the execution injection mode, the target fuel injection amount Qfd of the in-cylinder injection valve 25 and the port injection valve 26 so that the air-fuel ratio becomes the target air-fuel ratio (for example, the theoretical air-fuel ratio). Set * and Qfi *. Then, the in-cylinder injection valve 25 and the port injection valve 26 are controlled using the target fuel injection amounts Qfd * and Qfi *.

  Next, the operation of the automobile 10 of the embodiment configured as described above, particularly the operation when performing abnormality diagnosis in the in-cylinder injection mode and the port injection mode will be described. FIG. 2 is a flowchart illustrating an example of an abnormality diagnosis routine executed by the electronic control unit 70 of the embodiment. This routine is started when the ignition is turned on. The abnormality diagnosis in the in-cylinder injection mode or the port injection mode may include diagnosis of abnormality in the in-cylinder injection valve 26 or the port injection valve 26, diagnosis of whether or not a misfire has occurred in any cylinder, and the like. it can.

  When the abnormality diagnosis routine of FIG. 2 is executed, the electronic control unit 70 inputs data such as the coolant temperature Tw of the engine 12 and the execution injection mode (step S100). Here, a value detected by the water temperature sensor 42 is input as the cooling water temperature Tw of the engine 12. As the execution injection mode, a mode set based on the rotational speed Ne of the engine 12 and the volumetric efficiency KL in the fuel injection control described above is input.

  When the data is input in this way, the input cooling water temperature Tw of the engine 12 is compared with the threshold value Twref (step S110). Here, the threshold value Twref is a threshold value used for determining whether or not the engine 12 has been warmed up. For example, 70 ° C., 75 ° C., 80 ° C., or the like can be used.

  When the coolant temperature Tw of the engine 12 is lower than the threshold value Twref, it is determined that the engine 12 has not been warmed up, and whether the execution injection mode is the in-cylinder injection mode, the port injection mode, or the common injection mode. Check (step S120). When the execution injection mode is the common injection mode, the process returns to step S100.

  When the execution injection mode is the port injection mode in step S120, it is determined that the port injection mode is in effect (accordingly) based on the rotational speed Ne of the engine 12 and the volumetric efficiency KL, and abnormality diagnosis in the port injection mode is performed. At the same time (step S130), the port injection counter Cpfi is incremented by 1 when the engine 12 makes one revolution in the port injection mode (step S140), and the process returns to step S100. Here, the port injection counter Cpfi is set to a value 0 as an initial value when the ignition is turned on.

  When the execution injection mode is the in-cylinder injection mode in step S120, it is determined that the in-cylinder injection mode is in effect (accordingly) based on the rotational speed Ne of the engine 12 and the volumetric efficiency KL. While performing abnormality diagnosis (step S150), when the engine 12 makes one revolution in the in-cylinder injection mode, the in-cylinder injection counter Cdi is incremented by 1 (step S160), and the process returns to step S100. Here, the in-cylinder injection counter Cdi is set to a value 0 as an initial value when the ignition is turned on.

  When the coolant temperature Tw reaches or exceeds the threshold value Twref in step S110, the port injection counter Cpfi at that time is compared with the in-cylinder injection counter Cdi (step S170). When the port injection counter Cpfi is equal to or greater than the in-cylinder injection counter Cdi, A diagnostic port injection mode request is output (step S180). When the diagnostic port injection mode request is output, the port injection mode is set to the execution injection mode regardless of the engine speed Ne and the volumetric efficiency KL, and the fuel injection control of the engine 12 is performed.

  Then, abnormality diagnosis in the port injection mode is executed (step S190), and the port injection counter Cpfi is incremented by 1 when the engine 12 makes one revolution in the port injection mode (step S200), and the port injection counter Cpfi. Is compared with the threshold value Cpfiref (step S210). Here, the threshold value Cpfiref is a threshold value for determining whether or not the abnormality diagnosis in the port injection mode may be completed. For example, 190, 200, 210, or the like can be used. When the port injection counter Cpfi is less than the threshold value Cpfiref, the process returns to step S180.

  When the port injection counter Cpfi reaches the threshold value Cpfiref or more in step S210 while the processes of steps S180 to S210 are repeatedly executed, it is determined that the abnormality diagnosis in the port injection mode may be completed, and the diagnostic cylinder An internal injection mode request is output (step S220). When the diagnostic in-cylinder injection mode request is output, the in-cylinder injection mode is set to the execution injection mode regardless of the engine speed Ne and the volumetric efficiency KL, and the fuel injection control of the engine 12 is performed.

  Then, abnormality diagnosis in the in-cylinder injection mode is executed (step S230), and when the engine 12 makes one revolution in the in-cylinder injection mode, the in-cylinder injection counter Cdi is incremented by 1 (step S240). The internal injection counter Cdi is compared with the threshold value Cdiref (step S250). Here, the threshold value Cdiref is a threshold value for determining whether or not the abnormality diagnosis in the in-cylinder injection mode may be completed. For example, 190, 200, 210, or the like can be used. When the in-cylinder injection counter Cdi is less than the threshold value Cpfiref, the process returns to step S220. When the in-cylinder injection counter Cdi reaches the threshold value Cpfiref or more in step S250 while the processes of steps S220 to S250 are being repeatedly executed, it is determined that the abnormality diagnosis in the in-cylinder injection mode may be completed. This routine ends.

  As described above, when the coolant temperature Tw of the engine 12 reaches the threshold value Twref or more and the port injection counter Cpfi is greater than or equal to the in-cylinder injection counter Cdi, first, the port injection mode is maintained and the abnormality diagnosis in the port injection mode is performed. And the port injection counter Cpfi is counted up. When the port injection counter Cpfi reaches or exceeds the threshold value Cpfiref, the abnormality diagnosis in the port injection mode is completed. After that, when the in-cylinder injection mode is maintained and abnormality diagnosis is performed in the in-cylinder injection mode, the in-cylinder injection counter Cdi is counted up, and the in-cylinder injection counter Cdi reaches or exceeds the threshold Cdiref. Then, the abnormality diagnosis in the in-cylinder injection mode is completed. Accordingly, the in-cylinder injection mode is maintained regardless of the magnitude relationship between the in-cylinder injection counter Cdi and the port injection counter Cpfi when the cooling water temperature Tw of the engine 12 reaches the threshold value Twref or more. Compared to performing abnormality diagnosis in the port injection mode after performing abnormality diagnosis, the abnormality diagnosis in the port injection mode and abnormality diagnosis in the in-cylinder injection mode are compared to those performing the abnormality diagnosis in the port injection mode. One can be completed earlier. As a result, deterioration of fuel consumption, emission, and drivability can be suppressed.

  When the in-cylinder injection counter Cdi is larger than the port injection counter Cpfi in step S170, a diagnostic in-cylinder injection mode request is output (step S260), and the in-cylinder injection mode is performed, as in the processes in steps S220 to S250 described above. (Step S270), when the engine 12 makes one revolution in the in-cylinder injection mode, the in-cylinder injection counter Cdi is incremented by 1 (step S280), and the in-cylinder injection counter Cdi is set to a threshold value Cdiref. Compare (step S290). When the in-cylinder injection counter Cdi is less than the threshold value Cdiref, the process returns to step S260.

  If the in-cylinder injection counter Cdi reaches the threshold value Cdiref or more in step S290 while the processes in steps S260 to S290 are being repeatedly executed, the diagnostic port injection mode is performed in the same manner as in the processes in steps S180 to S210 described above. A request is output (step S300), abnormality diagnosis in the port injection mode is executed (step S310), and the port injection counter Cpfi is incremented by 1 when the engine 12 makes one revolution in the port injection mode (step S320). ), The port injection counter Cpfi is compared with the threshold value Cpfiref (step S330). When the port injection counter Cpfi is less than the threshold value Cpfiref, the process returns to step S300. If the port injection counter Cpfi reaches the threshold value Cpfiref or more in step S330 while the processes of steps S300 to S330 are being repeatedly executed, this routine is ended.

  As described above, when the in-cylinder injection counter Cdi is larger than the port injection counter Cpfi when the coolant temperature Tw of the engine 12 reaches the threshold value Twref or more, first, the in-cylinder injection mode is maintained and the in-cylinder injection mode is maintained. When the in-cylinder injection counter Cdi reaches the threshold value Cdiref or more, the abnormality diagnosis in the in-cylinder injection mode is completed. Thereafter, the port injection mode is maintained, abnormality diagnosis in the port injection mode is performed, and the port injection counter Cpfi is counted up. When the port injection counter Cpfi reaches or exceeds the threshold value Cpfiref, the port injection mode Complete the abnormality diagnosis at. As a result, the abnormality diagnosis is performed while maintaining the port injection mode regardless of the magnitude relationship between the in-cylinder injection counter Cdi and the port injection counter Cpfi when the cooling water temperature Tw of the engine 12 reaches the threshold value Twref or more. One of the abnormality diagnosis in the port injection mode and the abnormality diagnosis in the in-cylinder injection mode can be completed earlier than in the case where the abnormality diagnosis is performed while maintaining the in-cylinder injection mode. As a result, deterioration of fuel consumption, emission, and drivability can be suppressed.

  In the automobile 10 according to the embodiment described above, when the coolant temperature Tw of the engine 12 is lower than the threshold value Twref, the port injection mode is used in the port injection mode based on the rotational speed Ne of the engine 12 and the volumetric efficiency KL. And the port injection counter Cpfi is counted up, and the abnormality diagnosis in the in-cylinder injection mode is executed in the in-cylinder injection mode based on the engine speed Ne and the volumetric efficiency KL. And in-cylinder injection counter Cdi is counted up. If the port injection counter Cpfi is equal to or greater than the in-cylinder injection counter Cdi when the cooling water temperature Tw of the engine 12 reaches the threshold value Twref or higher, first, the port injection mode is maintained and abnormality diagnosis is performed in the port injection mode. At the same time, the port injection counter Cpfi is counted up, and the abnormality diagnosis in the port injection mode is completed when the port injection counter Cpfi reaches the threshold value Cpfiref or more. After that, when the in-cylinder injection mode is maintained and abnormality diagnosis is performed in the in-cylinder injection mode, the in-cylinder injection counter Cdi is counted up, and the in-cylinder injection counter Cdi reaches or exceeds the threshold Cdiref. Then, the abnormality diagnosis in the in-cylinder injection mode is completed. On the other hand, when the in-cylinder injection counter Cdi is larger than the port injection counter Cpfi when the coolant temperature Tw of the engine 12 reaches the threshold value Twref or more, first, the in-cylinder injection mode is maintained, and an abnormality in the in-cylinder injection mode occurs. The diagnosis is executed and the in-cylinder injection counter Cdi is counted up. When the in-cylinder injection counter Cdi reaches the threshold value Cdiref or more, the abnormality diagnosis in the in-cylinder injection mode is completed. Thereafter, the port injection mode is maintained, abnormality diagnosis in the port injection mode is performed, and the port injection counter Cpfi is counted up. When the port injection counter Cpfi reaches or exceeds the threshold value Cpfiref, the port injection mode Complete the abnormality diagnosis at. Thus, one of the abnormality diagnosis in the port injection mode and the abnormality diagnosis in the in-cylinder injection mode can be completed earlier. As a result, deterioration of fuel consumption, emission, and drivability can be suppressed.

  In the automobile 10 according to the embodiment, when the cooling water temperature Tw of the engine 12 reaches the threshold value Twref or more and the port injection counter Cpfi and the in-cylinder injection counter Cdi are the same, the port injection counter Cpfi is set to the port until the port injection counter Cpfi reaches the threshold value Cpfiref or more. After performing the abnormality diagnosis while maintaining the injection mode, the abnormality diagnosis is performed while maintaining the in-cylinder injection mode until the in-cylinder injection counter Cdi reaches the threshold value Cdiref or more. However, at this time, the in-cylinder injection mode is maintained until the in-cylinder injection counter Cdi reaches the threshold value Cdiref or more and the abnormality diagnosis is performed, and then the port injection counter Cpfi is maintained in the port injection mode until the threshold value Cpfiref or more is exceeded. A diagnosis may be executed.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problems will be described. In the embodiment, the engine 12 corresponds to “engine”, and the electronic control unit 70 corresponds to “control means”, “count-up means”, and “abnormality diagnosis means”.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem is the same as that of the embodiment described in the column of means for solving the problem. Therefore, the elements of the invention described in the column of means for solving the problems are not limited. That is, the interpretation of the invention described in the column of means for solving the problems should be made based on the description of the column, and the examples are those of the invention described in the column of means for solving the problems. It is only a specific example.

  As mentioned above, although the form for implementing this invention was demonstrated using the Example, this invention is not limited at all to such an Example, In the range which does not deviate from the summary of this invention, it is with various forms. Of course, it can be implemented.

  The present invention can be used in the automobile manufacturing industry.

 DESCRIPTION OF SYMBOLS 10 Car, 12 Engine, 16 Crankshaft, 22 Air cleaner, 24 Throttle valve, 25 In-cylinder injection valve, 26 Port injection valve, 28 Intake valve, 29 Combustion chamber, 30 Spark plug, 31 Exhaust valve, 32 Piston, 34 Purification device , 35a Air-fuel ratio sensor, 35b Oxygen sensor, 36 Throttle motor, 38 Ignition coil, 40 Crank position sensor, 42 Water temperature sensor, 44 Cam position sensor, 46 Throttle valve position sensor, 48 Air flow meter, 49 Temperature sensor, 70 Electronic control unit .

Claims (1)

An engine having an in-cylinder injection valve that injects fuel into the cylinder and a port injection valve that injects fuel into the intake port;
An in-cylinder injection mode in which an in-cylinder injection ratio that is a ratio of a fuel injection amount from the in-cylinder injection valve to a total fuel injection amount from the in-cylinder injection valve and the port injection valve is a first predetermined ratio or more; A port injection mode in which the in-cylinder injection ratio is less than or equal to a second predetermined ratio that is smaller than the first predetermined ratio, and the in-cylinder injection ratio is less than the first predetermined ratio and greater than the second predetermined ratio. Control means for switching the common injection mode to control the engine;
A car equipped with
Count-up means for counting up the first counter when in the port injection mode and counting up the second counter when in the in-cylinder injection mode;
When the cooling water temperature of the engine is lower than a predetermined water temperature, an abnormality diagnosis in the port injection mode is performed when the port injection mode is entered according to the operating state of the engine, and the engine is operated according to the operating state of the engine. When the in-cylinder injection mode is entered, an abnormality diagnosis is performed in the in-cylinder injection mode,
If the first counter is larger than the second counter when the cooling water temperature is equal to or higher than the predetermined water temperature, the control means is made to hold the port injection mode and execute an abnormality diagnosis in the port injection mode. Is completed when the first counter reaches a first predetermined value or more, and thereafter, the control means is made to hold the in-cylinder injection mode to perform an abnormality diagnosis in the in-cylinder injection mode. 2 when the counter reaches the second predetermined value or more,
When the second counter is larger than the first counter when the cooling water temperature is equal to or higher than the predetermined water temperature, the control unit is made to maintain the in-cylinder injection mode and perform abnormality diagnosis in the in-cylinder injection mode. And is completed when the second counter reaches the second predetermined value or more, and thereafter, the control means is made to hold the port injection mode to execute abnormality diagnosis in the port injection mode. An abnormality diagnosis means that is completed when a first counter reaches the first predetermined value or more;
Automobile equipped with.

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