JP2011185117A - Control device for internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control device for an internal combustion engine capable of reducing the start-up time of the internal combustion engine. <P>SOLUTION: The control device 1 for the internal combustion engine includes cylinder pressure sensors 4-7 for detecting the cylinder internal pressure of cylinders of the internal combustion engine, a first CPU core 11 for calculating the controlled variable of the internal combustion engine based on the cylinder internal pressure detected by the cylinder pressure sensor 4-7, a second CPU core 12 for controlling the internal combustion engine, a first RAM 13 associated with the first CPU core 11, a second RAM 14 associated with the second CPU core 12, a first ADC 16 for AD-converting the detection signal of the cylinder internal pressure, and a DMAC 20 for writing the AD-converted detection signal of the cylinder internal pressure in the first RAM 13 or the second RAM 14. The DMAC 20 writes the AD-converted detection signal of the cylinder internal pressure in the second RAM 14 at start control, and the second CPU core 12 performs the start control of the internal combustion engine based on the controlled variable calculated by the second CPU core 12 based on the detection signal of the cylinder internal pressure of the second RAM 15. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an internal combustion engine control device.

  As an internal combustion engine control device in the above technical field, devices adopting various configurations have been proposed. For example, Patent Document 1 includes a crank angle synchronization processing unit that performs processing based on crank angle synchronization in a control of an internal combustion engine of a vehicle and a time synchronization processing unit that performs processing based on time synchronization. The internal combustion engine control device is described in which the above process and the time synchronization process are prevented from interfering with each other.

JP 2006-17054 A

  By the way, in the internal combustion engine control apparatus as described above, it is strongly desired to start the internal combustion engine early, that is, to shorten the start-up time, in order to further improve convenience.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an internal combustion engine control device that can shorten the startup time of an internal combustion engine.

  In order to solve the above-described problems, the present invention is an internal combustion engine control device that includes a plurality of cores and includes a multi-core processor that performs calculations related to control of the internal combustion engine, and detects an internal combustion engine state quantity related to the state of the internal combustion engine. A state quantity detection means for performing the operation, a first core for calculating the control amount of the internal combustion engine based on the internal combustion engine state quantity detected by the state quantity detection means, a second core for controlling the internal combustion engine, A first RAM [Random Access Memory] associated with the core, a second RAM associated with the second core, and a first conversion means for AD-converting a detection signal of the internal combustion engine state quantity by the state quantity detection means; And a writing means for writing the detection signal of the internal combustion engine state quantity converted by AD (Analog to Digital) into the first RAM or the second RAM by the first conversion means. First strange An internal combustion engine state quantity detection signal AD converted by the conversion means is written in the first RAM, and the first core is based on the control amount calculated based on the internal combustion engine state quantity detection signal written in the first RAM. The second core controls the internal combustion engine, and at the time of starting control, the writing means writes the detection signal of the internal combustion engine state quantity AD-converted by the first conversion means to the second RAM, and the second core The second core performs start control of the internal combustion engine based on a control amount calculated based on the detection signal of the internal combustion engine state quantity written in the second RAM. Here, the fact that the first RAM is attached to the first core means a state in which the first core and the first RAM are connected by a dedicated bus, and is connected only by the common bus to the first core. This includes a state in which the first core can preferentially access the first RAM even if it is.

  According to the internal combustion engine control device of the present invention, in the multi-core processor in which the arithmetic processing is shared by a plurality of cores, the second core is based on the control amount of the internal combustion engine calculated by the first core during normal control of the internal combustion engine. By controlling the internal combustion engine, the arithmetic processing is appropriately shared and the processing capacity can be improved. In addition, during the start control of the internal combustion engine, the second core performs both the calculation of the control amount and the start control of the internal combustion engine, so that the internal combustion engine state quantity becomes the first core and the first RAM. Since there is no delay in communication time due to passing through the engine, it is possible to shorten the starting time of the internal combustion engine. Further, in this internal combustion engine control device, the detection signal of the internal combustion engine state quantity AD-converted by the first conversion means during the start control of the internal combustion engine is written in the second RAM, so the second core is attached to itself. The control amount can be calculated by reading the internal combustion engine state quantity detection signal from the second RAM. Therefore, according to this internal combustion engine control device, the second core detects the internal combustion engine state quantity as compared with the case where the detection signal of the internal combustion engine state quantity is written in the first RAM or the like not associated with the second core. Since the signal can be read at high speed, the calculation speed of the control amount by the second core can be improved. This contributes to shortening the starting time of the internal combustion engine.

  Further, in the internal combustion engine control apparatus according to the present invention, the internal combustion engine state quantity is an in-cylinder pressure of a plurality of cylinders of the internal combustion engine, and the first core and the second core are in normal control of the internal combustion engine. A control amount of the internal combustion engine is calculated based on in-cylinder pressures of a plurality of cylinders, and whether there is an abnormality based on a comparison between the control amount calculated by the first core and the control amount calculated by the second core It is preferable to determine.

  According to this internal combustion engine control device, when the control amount of the internal combustion engine is calculated by the first core during the normal control of the internal combustion engine, the control amount of the internal combustion engine is also calculated by the second core. It is possible to determine an abnormality of the apparatus based on a comparison between the control amount of the internal combustion engine calculated by the first core and the control amount of the internal combustion engine calculated by the second core. Therefore, according to this internal combustion engine control device, it is possible to determine and deal with an abnormality, so that the reliability of the device can be improved.

  Alternatively, the internal combustion engine control apparatus according to the present invention further includes second conversion means for AD-converting the internal combustion engine state quantity detected by the state quantity detection means, and the internal combustion engine state quantity is obtained from a plurality of cylinders of the internal combustion engine. In-cylinder pressure, the first conversion means performs AD conversion on the detection signal of the in-cylinder pressure of each of the plurality of cylinders, and the second conversion means outputs a signal obtained by adding the detection signals of the in-cylinder pressure of the plurality of cylinders. The AD conversion and writing means causes the detection signal AD-converted by the first conversion means to be written in the first RAM, and the signal obtained by adding the detection signals AD-converted by the second conversion means is the second RAM. The first core calculates the control amount of the internal combustion engine based on the detection signal written in the first RAM, and the second core adds the detection signal written in the second RAM. Internal combustion engine based on the combined signal It calculates the control amount, it is preferable to determine whether there is an abnormality based on a comparison of the computed control amount calculated control amount of the first core and the second core.

  According to this internal combustion engine control device, the control amount of the internal combustion engine calculated by the first core via the first conversion means and the first RAM and the second conversion means and the second RAM via the second RAM. Since abnormality is determined based on the comparison with the control amount of the internal combustion engine calculated by the core of No. 2, it is possible to efficiently determine the presence or absence of abnormality of all elements of the conversion means, RAM, and core. Moreover, since the combustion timings of the plurality of cylinders are different and the change in the in-cylinder pressure is also different for each cylinder, the control amount of the internal combustion engine can be calculated from the signal obtained by adding the in-cylinder pressure detection signals of the plurality of cylinders. By combining the signals input to the second conversion means into one, the number of input channels of the second conversion means can be reduced. Therefore, according to this internal combustion engine control device, the number of input channels of the second conversion means can be reduced, so that the configuration of the device can be simplified and the cost can be reduced.

  According to the present invention, the starting time of the internal combustion engine can be shortened.

1 is a block diagram showing an embodiment of an internal combustion engine control device according to the present invention. It is a flowchart which shows the flow of a process of CPU of an internal combustion engine control apparatus. It is a flowchart which shows the flow of the process at the time of starting control. It is a flowchart which shows the flow of the process at the time of normal control. It is a flowchart which shows the flow of the process at the time of high rotation control.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, in each figure, the same code | symbol is attached | subjected to the same or an equivalent part, and the overlapping description is abbreviate | omitted.

  As shown in FIG. 1, an internal combustion engine control apparatus 1 according to the present embodiment controls an internal combustion engine of a vehicle. In the present embodiment, a case where a four-cylinder reciprocating engine is controlled as an internal combustion engine will be described. The internal combustion engine control device 1 includes an ECU [Electronic Control Unit] 2 that comprehensively controls the entire device.

  The ECU 2 is connected to the crank sensor 3, the first in-cylinder pressure sensor 4, the second in-cylinder pressure sensor 5, the third in-cylinder pressure sensor 6, and the fourth in-cylinder pressure sensor 7. The crank sensor 3 is a sensor that detects the rotation angle of the crankshaft of the internal combustion engine. The crank angle signal output from the crank sensor 3 is output as a one-cycle pulse signal at an angle of 10 CA, for example, and input to the ECU 2.

  The first in-cylinder pressure sensor 4, the second in-cylinder pressure sensor 5, the third in-cylinder pressure sensor 6, and the fourth in-cylinder pressure sensor 7 are provided in four cylinders of the internal combustion engine, respectively. It is a sensor to detect. The in-cylinder pressure signals output from the in-cylinder pressure sensors 4 to 7 are input to the ECU 2 and sampled at a predetermined detection timing. The in-cylinder pressure sensors 4 to 7 function as state quantity detection means described in the claims, and the in-cylinder pressure of the cylinder corresponds to the internal combustion engine state quantity described in the claims.

  The ECU 2 has a CPU (Central Processing Unit) 10 that performs arithmetic processing related to control of the internal combustion engine. The CPU 10 is a dual core processor having two CPU cores 11 and 12. The CPU 10 receives the in-cylinder pressure signals of the in-cylinder pressure sensors 4 to 7 filtered by the LPF [Low Pass Filter] and the crank angle signal of the crank sensor 3.

  The CPU 10 includes a first CPU core 11, a second CPU core 12, a first RAM [Random Access Memory] 13, a second RAM 14, and a ROM [Read Only Memory] 15. Further, the CPU 10 includes a first ADC [Analog to Digital Converter] 16, a second ADC 17, a timer 18, a crank timer 19, a DMAC [Direct Memory Access Controller] 20, and a setting switching circuit 21. Each component in the CPU 10 is connected to each other via an internal bus.

  The first CPU core 11 is a CPS (Cylinder Pressure Sensor) core that calculates the in-cylinder pressure control amount of the internal combustion engine based on the in-cylinder pressure signals input from the in-cylinder pressure sensors 4 to 7. Such in-cylinder pressure control amount includes, for example, an ignition timing control amount used for ignition control. The first CPU core 11 writes the calculated control amount of the internal combustion engine in the first RAM 13 attached to the first CPU core 11 itself. Here, the fact that the first RAM 13 is attached to the first CPU core 11 means a state in which the first CPU core 11 and the first RAM 13 are connected by a dedicated bus, as well as the first CPU core 11. In this case, the first CPU core 11 includes a state in which the first RAM 13 can be preferentially accessed even when only the common bus is connected.

  The second CPU core 12 is an internal combustion engine control core that controls the internal combustion engine. The second CPU core 12 calculates the in-cylinder pressure control amount based on the in-cylinder pressure signals input from the in-cylinder pressure sensors 4 to 7 in accordance with the setting of the setting switching circuit 21. The second CPU core 12 writes the calculated in-cylinder pressure control amount in the second RAM 14 attached to the second CPU core 12. The second CPU core 12 executes control of the internal combustion engine based on the in-cylinder pressure control amount written in the first RAM 13 or the second RAM 14. The second CPU core 12 and the first CPU core 11 execute various arithmetic processes and controls by loading various application programs from the ROM 15 functioning as a main storage device.

  Further, the second CPU core 12 performs a simple calculation of the in-cylinder pressure control amount based on the in-cylinder pressure signals input from the in-cylinder pressure sensors 4 to 7 in accordance with the setting of the setting switching circuit 21. A simple calculation is an operation with a short calculation time in which a part of the calculation process is simplified compared to a normal calculation. After execution of the simplified calculation, the second CPU core 12 determines the in-cylinder pressure control amount written in the first RAM 13 and the second RAM 14, that is, the in-cylinder pressure control amount calculated by the first CPU core 11 and the second in-cylinder pressure control amount. It is determined whether or not the difference from the in-cylinder pressure control amount calculated by the CPU core 12 is equal to or less than a predetermined threshold value.

  When the second CPU core 12 determines that the difference between the in-cylinder pressure control amount calculated by the first CPU core 11 and the in-cylinder pressure control amount calculated by the second CPU core 12 is equal to or less than a predetermined threshold value, The CPU 10 determines that there is no abnormality and continues to control the internal combustion engine. When the second CPU core 12 determines that the difference between the in-cylinder pressure control amount calculated by the first CPU core 11 and the in-cylinder pressure control amount calculated by the second CPU core 12 exceeds a predetermined threshold. The CPU 10 determines that there is an abnormality and stops the control of the internal combustion engine.

  The first ADC 16 has four in-cylinder pressure input channels corresponding to each of the in-cylinder pressure sensors 4 to 7. The first ADC 16 performs AD [Analog to Digital] conversion of the in-cylinder pressure signals input from the in-cylinder pressure sensors 4 to 7. The first ADC 16 performs AD conversion by time synchronization of the timer 18 or crank angle synchronization of the crank timer 19. The crank timer 19 performs crank angle synchronization processing according to the crank angle signal of the crank sensor 3. The first ADC 16 functions as a first conversion unit described in the claims.

  The second ADC 17 has one in-cylinder pressure input channel to which the in-cylinder pressure signals output from the in-cylinder pressure sensors 4 to 7 are added and input. The second ADC 17 performs AD conversion of the in-cylinder pressure signal obtained by adding the in-cylinder pressure sensors 4 to 7 in synchronization with the timer 18. The second ADC 17 functions as second conversion means described in the claims.

  The DMAC 20 is a control unit that implements DMA [Direct Memory Access], which is a data transfer method that does not pass through the first CPU core 11 and the second CPU core 12. The DMAC 20 directly writes the in-cylinder pressure signal obtained by AD conversion of the first ADC 16 from the first ADC 16 to the first RAM 13 or the second RAM 14. Further, the DMAC 20 directly writes the in-cylinder pressure signal obtained by AD conversion of the second ADC 17 from the second ADC 17 to the first RAM 13. The DMAC 20 functions as a writing unit described in the claims.

  Based on the crank angle signal of the crank sensor 3, the setting switching circuit 21 determines whether the internal combustion engine is in a control state of start control, normal control, or high rotation control. The setting switching circuit 21 performs a start control setting process when it is determined that the internal combustion engine is in the start control. In the start control setting process, the setting switching circuit 21 starts AD conversion of the in-cylinder pressure signal by the first ADC 16 in time synchronization with the timer 18, and the DMAC 20 performs second conversion of the in-cylinder pressure signal obtained by AD conversion of the first ADC 16. The setting is switched so as to be written in the RAM 14.

  The setting switching circuit 21 performs normal control setting processing when it is determined that the internal combustion engine is in normal control. In the normal control setting process, the setting switching circuit 21 starts AD conversion of the in-cylinder pressure signal when the first ADC 16 synchronizes with the crank angle of the crank timer 19, and the DMAC 20 converts the in-cylinder pressure signal obtained by AD conversion of the first ADC 16. The setting is switched so as to be written in the first RAM 13. At the same time, in the setting switching circuit 21, the second ADC 17 starts AD conversion of the in-cylinder pressure signal by time synchronization of the timer 18, and the DMAC 20 writes the in-cylinder pressure signal converted by the second ADC 17 into the first RAM 13. Change the settings so that

  The setting switching circuit 21 performs high rotation control when it is determined that the internal combustion engine is in high rotation control. The setting switching circuit 21 determines the share of the arithmetic processing for the first CPU core 11 and the second CPU core 12 from the rotational speed of the internal combustion engine in the high rotation control setting process. In determining the sharing ratio, for example, considering the processing load status of the first CPU core 11 and the second CPU core 12 according to the rotation speed, the rotation speed and the sharing ratio are set so as to obtain an optimum processing status. The associated share ratio map data is used. The setting switching circuit 21 starts the AD conversion of the in-cylinder pressure signal by the first ADC 16 in synchronization with the crank angle of the crank timer 19, and the in-cylinder pressure that the DMAC 20 performs the AD conversion of the first ADC 16 according to the determined sharing ratio. The setting is switched so that the signal is written to the first RAM 13 or the second RAM 14. In the setting switching circuit 21, switching of hardware settings with higher reliability is realized instead of switching of software settings.

  Next, the flow of processing in the CPU 10 of the above-described internal combustion engine control apparatus 1 will be described with reference to the drawings.

  As shown in FIG. 2, the crank angle signal of the crank sensor 3 is first input to the CPU 10 of the internal combustion engine controller 1 (S1). Note that the in-cylinder pressure signals of the in-cylinder pressure sensors 4 to 7 are continuously input to the CPU 10 at a predetermined detection timing. The setting switching circuit 21 of the CPU 10 determines whether or not the internal combustion engine is in starting control based on the input crank angle signal of the crank sensor 3 (S2).

  As shown in FIG. 3, the setting switching circuit 21 performs a start control setting process when it is determined that the internal combustion engine is in the start control (S3). After the start control setting process, the AD conversion process of the in-cylinder pressure signal is performed by the first ADC 16 in synchronization with the time of the timer 18 (S4). The in-cylinder pressure signal obtained by AD conversion of the first ADC 16 is directly written into the second RAM 14 by the DMAC 20.

  Thereafter, the second CPU core 12 calculates the in-cylinder pressure control amount of the internal combustion engine based on the in-cylinder pressure signal written in the second RAM 14 (S5). The second CPU core 12 writes the calculated in-cylinder pressure control amount in the second RAM 14 attached to the second CPU core 12. The second CPU core 12 executes start control of the internal combustion engine based on the in-cylinder pressure control amount written in the second RAM 14 (S6). After the start control is executed, the process returns to S1.

  On the other hand, as shown in FIG. 2, when the setting switching circuit 21 determines in S2 that the internal combustion engine is not in the start control time, whether the internal combustion engine is in the normal control time based on the crank angle signal of the crank sensor 3 or not. It is determined whether or not (S7).

  As shown in FIG. 4, the setting switching circuit 21 performs normal control setting processing when it is determined that the internal combustion engine is in normal control (S8). After the normal control setting process, the AD conversion process of the in-cylinder pressure signal by the first ADC 16 synchronized with the crank angle of the crank timer 19 is performed (S9). The in-cylinder pressure signal obtained by AD conversion of the first ADC 16 is directly written into the first RAM 13 by the DMAC 20. Thereafter, the first CPU core 11 calculates the in-cylinder pressure control amount of the internal combustion engine based on the in-cylinder pressure signal written in the first RAM 13 (S10). The first CPU core 11 writes the calculated in-cylinder pressure control amount in the first RAM 13.

  Similarly, after the normal control setting process of S8, the AD conversion process of the in-cylinder pressure signal (the signal obtained by adding the signals for each cylinder) by the second ADC 17 synchronized with the time of the timer 18 is performed (S11). The in-cylinder pressure signal obtained by AD conversion of the second ADC 17 is directly written into the second RAM 14 by the DMAC 20. Thereafter, the second CPU core 12 performs a simple calculation of the in-cylinder pressure control amount of the internal combustion engine based on the in-cylinder pressure signal written in the second RAM 14 (S12). The second CPU core 12 writes the calculated in-cylinder pressure control amount in the second RAM 14.

  Thereafter, the second CPU core 12 determines the in-cylinder pressure control amount written in the first RAM 13 and the second RAM 14, that is, the in-cylinder pressure control amount calculated by the first CPU core 11 and the second CPU core 12. It is determined whether or not the difference from the calculated in-cylinder pressure control amount is equal to or less than a predetermined threshold (S13).

  When the second CPU core 12 determines that the difference between the in-cylinder pressure control amount calculated by the first CPU core 11 and the in-cylinder pressure control amount calculated by the second CPU core 12 is equal to or less than a predetermined threshold value, The CPU 10 determines that there is no abnormality and executes normal control of the internal combustion engine (S14). After executing the normal control, the process returns to S1. The second CPU core 12 determines that the difference between the in-cylinder pressure control amount calculated by the first CPU core 11 and the in-cylinder pressure control amount calculated by the second CPU core 12 exceeds a predetermined threshold value. If so, the CPU 10 determines that there is an abnormality and stops the control of the internal combustion engine (S15).

  As shown in FIG. 5, if the setting switching circuit 21 determines in S7 that the internal combustion engine is not in normal control, it determines that the internal combustion engine is in high rotation control and performs high rotation control setting processing. (S16). In the high rotation control setting process, the distribution ratio of the calculation process to the first CPU core 11 and the second CPU core 12 is determined according to the rotation speed of the internal combustion engine.

  After the high rotation control setting process, the AD conversion process of the in-cylinder pressure signal by the first ADC 16 synchronized with the crank angle of the crank timer 19 is performed (S17). Thereafter, the in-cylinder pressure signal obtained by AD conversion of the first ADC 16 is written in the first RAM 13 or the second RAM 14 in accordance with the distribution ratio of the arithmetic processing determined by the setting switching circuit 21.

  The first CPU core 11 and the second CPU core 12 calculate the in-cylinder pressure control amount based on the in-cylinder pressure signal distributed and written to the first RAM 13 and the second RAM 14, respectively (S18). The first CPU core 11 writes the calculated in-cylinder pressure control amount in the first RAM 13. The second CPU core 12 writes the calculated in-cylinder pressure control amount in the second RAM 14. Thereafter, the second CPU core 12 executes high rotation control of the internal combustion engine based on the in-cylinder pressure control amount written in the second RAM 14 (S19). After executing the high rotation control, the process returns to S1.

  Next, the effect of the internal combustion engine control device 1 described above will be described.

  According to the internal combustion engine control apparatus 1 according to the present embodiment, in the CPU 10 functioning as a multi-core processor in which the two CPU cores 11 and 12 share the arithmetic processing, the first CPU core 11 is the cylinder during normal control of the internal combustion engine. The in-cylinder pressure control amount of the internal combustion engine is calculated based on the pressure, and the second CPU core 12 controls the internal combustion engine based on the in-cylinder pressure control amount, so that the calculation processing is shared and the processing capacity is improved. be able to. Further, since the second CPU core 12 performs both the calculation of the in-cylinder pressure control amount and the start control of the internal combustion engine during the start control of the internal combustion engine, the in-cylinder pressure signal is transmitted to the first CPU core 11 and the first CPU core 11. There is no communication time delay due to passing through the RAM, and the start-up time of the internal combustion engine can be shortened. As a result, for example, in a vehicle having an idling stop function, the smoothness of restart of the internal combustion engine can be improved. Further, according to the present invention, the battery capacity for starter operation can be reduced, and the cost of the vehicle can be reduced.

  Further, according to the internal combustion engine control apparatus 1, the in-cylinder pressure signal AD-converted by the first ADC 16 is written in the second RAM 14 during the start control of the internal combustion engine, so that the second CPU core 12 is attached to itself. The in-cylinder pressure signal can be read from the second RAM 17 and the in-cylinder pressure control amount can be calculated. Therefore, according to the internal combustion engine control apparatus 1, the second CPU core 12 transmits the in-cylinder pressure signal at a higher speed than when the in-cylinder pressure signal is written in the first RAM 13 or the like not associated with the second CPU core 12. Therefore, the calculation speed of the in-cylinder pressure control amount by the second CPU core 12 can be improved. This contributes to shortening the starting time of the internal combustion engine.

  Furthermore, according to the internal combustion engine control apparatus 1, when the control amount of the internal combustion engine is calculated by the first CPU core 11 during the normal control of the internal combustion engine, the control amount of the internal combustion engine is also controlled by the second CPU core 12. By performing the calculation, the abnormality of the apparatus is determined based on a comparison between the in-cylinder pressure control amount of the internal combustion engine calculated by the first CPU core 11 and the in-cylinder pressure control amount of the internal combustion engine calculated by the second CPU core 12. Can be determined. In addition, the in-cylinder pressure control amount of the internal combustion engine calculated by the first CPU core 11 via the first ADC 16 and the first RAM 13 and the second CPU core 12 via the second ADC 17 and the second RAM 14. Since the abnormality is determined on the basis of the comparison with the in-cylinder pressure control amount of the internal combustion engine calculated in step 1, the presence / absence of abnormality of all the elements of the CPU cores 11, 12, RAMs 13, 14, and ADCs 16, 17 is efficiently determined. Can do. Therefore, according to the internal combustion engine control apparatus 1, it is possible to determine and deal with an abnormality, so that the reliability of the apparatus can be improved.

  Further, according to the internal combustion engine control apparatus 1, since the combustion timings of the four cylinders are different and the changes in the in-cylinder pressure are also different for each cylinder, the in-cylinder pressure of the internal combustion engine is determined from the signal obtained by adding the in-cylinder pressure signals of the four cylinders. Based on the fact that the control amount can be calculated, the number of input channels of the second ADC 17 can be reduced by combining the signals input to the second ADC 17 into one. Therefore, according to the internal combustion engine control device 1, the number of input channels of the second ADC 17 can be reduced, so that the configuration of the device can be simplified and the cost can be reduced.

  Furthermore, according to the internal combustion engine control apparatus 1, in the high speed control of the internal combustion engine, the first CPU core 11 and the second CPU core 12 are appropriately configured to perform the calculation process of the in-cylinder pressure control amount according to the processing load situation. By sharing, processing load can be reduced, and highly reliable in-cylinder pressure control in high rotation control can be realized.

  The present invention is not limited to the embodiment described above. For example, in the above-described embodiment, a case where a four-cylinder reciprocating engine is controlled as an internal combustion engine has been described. However, the number of cylinders is not limited to four, and a hybrid engine including a motor as a drive source is used. Can also be suitably applied.

  Further, the number of CPU cores is not limited to two, and may be three or more. Further, the state quantity of the internal combustion engine described in the claims is not limited to the in-cylinder pressure of the cylinder.

  Further, the first CPU core 11 and the second CPU core 12 may have a common ADC and RAM. Thus, even if the ADC and RAM are common, the first CPU core 11 and the second CPU core 12 calculate the in-cylinder pressure control amount, and the in-cylinder pressure control amount calculated by each CPU core 11, 12. By detecting the abnormality by comparing the two, it is possible to appropriately determine whether or not there is an abnormality in the first CPU core 11 and the second CPU core 12 and the components that are not common.

  DESCRIPTION OF SYMBOLS 1 ... Internal combustion engine control apparatus 2 ... ECU 3 ... Crank sensor 4-7 ... In-cylinder pressure sensor (state quantity detection means) 10 ... CPU (multi-core processor) 11 ... 1st CPU core 12 ... 2nd CPU core 13 ... 1st 1 RAM 14 ... second RAM 16 ... first ADC (first conversion means) 17 ... second ADC (second conversion means) 20 ... DMAC (writing means) 21 ... setting switching circuit

Claims (3)

An internal combustion engine control device having a plurality of cores and including a multi-core processor that performs calculations related to control of the internal combustion engine,
State quantity detection means for detecting an internal combustion engine state quantity relating to the state of the internal combustion engine;
A first core for calculating a control amount of the internal combustion engine based on the internal combustion engine state quantity detected by the state quantity detection means;
A second core for controlling the internal combustion engine;
A first RAM associated with the first core;
A second RAM associated with the second core;
First conversion means for AD converting the detection signal of the internal combustion engine state quantity by the state quantity detection means;
Writing means for writing the detection signal of the internal combustion engine state quantity AD-converted by the first conversion means into the first RAM or the second RAM;
With
During normal control, the writing means writes the detection signal of the internal combustion engine state quantity AD-converted by the first converting means to the first RAM, and the first core is written to the first RAM. The second core controls the internal combustion engine based on the control amount calculated based on the detection signal of the internal combustion engine state quantity;
At the start control time, the writing means writes the detection signal of the internal combustion engine state quantity AD-converted by the first conversion means to the second RAM, and the second core is written to the second RAM. An internal combustion engine control device, wherein the second core performs start control of the internal combustion engine based on the control amount calculated based on the detection signal of the internal combustion engine state quantity. The internal combustion engine state quantity is an in-cylinder pressure of a plurality of cylinders of the internal combustion engine,
The first core and the second core calculate a control amount of the internal combustion engine based on in-cylinder pressures of the plurality of cylinders during normal control of the internal combustion engine,
2. The internal combustion engine according to claim 1, wherein it is determined whether or not there is an abnormality based on a comparison between the control amount calculated by the first core and the control amount calculated by the second core. Engine control device. A second conversion means for AD converting the internal combustion engine state quantity detected by the state quantity detection means;
The internal combustion engine state quantity is an in-cylinder pressure of a plurality of cylinders of the internal combustion engine,
The first conversion means performs AD conversion on a detection signal of in-cylinder pressure of each of the plurality of cylinders,
The second conversion means performs AD conversion on a signal obtained by adding the detection signals of the in-cylinder pressures of the plurality of cylinders,
The writing means writes the detection signal AD-converted by the first conversion means into the first RAM, and adds a signal obtained by adding the detection signals AD-converted by the second conversion means to the first RAM. 2 to the RAM
The first core calculates a control amount of the internal combustion engine based on the detection signal written in the first RAM,
The second core calculates a control amount of the internal combustion engine based on a signal obtained by adding the detection signals written in the second RAM,
The internal combustion engine according to claim 2, wherein it is determined whether or not there is an abnormality based on a comparison between the control amount calculated by the first core and the control amount calculated by the second core. Engine control device.

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